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Implementation of slag stabilized blended calcium sulfate (BCS) in a pavement structure.
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Implementation of slag stabilized blended calcium sulfate (BCS) in a pavement structure.
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    This research project was the field implementation follow up to laboratory research conducted at LTRC. The research met a need and benefited District 61 staff by allowing an alternative to the removal and replacement of the old, non-standard blended calcium sulfate (BCS) found on site. The researchers used the previous research to draft, finalize, approve, and implement specifications to allow for the stabilization of BCS with ground granulated blast furnace slag grade 120 (slag) on the shoulders of US 61 just south of LA 22 in Sorrento, LA. Two specifications were used. The first addressed the inplace stabilization of BCS with slag. The second specification addressed a market-driven implementation of the research, specifically the applicability of Honeywell’s “fines” material treated with slag in a pugmill for use as base material. The researchers worked with Honeywell, District 61 staff, and the contractor to design a plan for the test sections. The partnership with Honeywell and its contractor, Brown Industries and their investment (financial & reputation) toward the project benefited the research. The four test sections were constructed and gained strength over time. The FWD, Dynaflect, DCP, and field cores confirmed the increase in strength over time. Stabilizing old, non-standard BCS inplace, provided a cost benefit of $15.5/s.y., which realized a saving of $55,000 for the test sections. The use of BCS within DOTD as a base course material can be supplemented with the addition of a slag-stabilized BCS (inplace and pugmilled). Researchers recommend the use of slag stabilization in BCS encountered during forensic or rehabilitation operations as a cost effective way to deal with these areas of old, non-standard BCS. The design slag percentages should verified with laboratory testing and then increased slightly to account for spreading inconsistencies, and increased surface areas of old, non-standard BCS or new Honeywell “fines” material. The original 08-3GT research proved that Slag-stabilization of BCS can reduce moisture sensitivity of BCS. A secondary benefit was that the slag-BCS reaction reduced the likelihood of expansive reactions, as compared to mixing BCS with cement. The pug-mill process is a way balance the construction moisture of the mixture to create the slag/BCS reaction without excess moisture that may cause pumping. Further refinements to the pugmill plant process are necessary to ensure consistency. This research also offered DOTD another base course alternative that addresses the “Green” philosophy and market need to dispose of BCS. The researchers recommend that care, including site selection and specific testing with onsite materials, be used in selecting sites for the application and implementation of this research.
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